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对正常工作状态下的非超长土钉支护,尤其是当基坑周围存在已有建筑物时,尝试用一种新的土钉与周围上体的相互作用有限元方法来解决,模型中的土体单元和土钉单元由于节点自由度的不同,采用自由度的相互约束并借助于大型有限元程序Ansys的约束方程来进行数值模拟,使土体的线自由度和土钉的转动自由度协调起来,解决了不同单元自由度的连接问题,得出不同位置处土钉的内力分布及开挖面的位移。与已公认的土钉支护有关结论比较,结果吻合较好。
For non-extra-long soil nailing under normal working conditions, especially when there are existing structures around the foundation pit, an attempt is made to solve the problem by using a new finite element method of interaction between the soil nail and the surrounding upper body. In the model Due to the different degrees of freedom of the nodes, the soil element and the soil nail element are constrained by the degree of freedom and are constrained by the finite element program Ansys. The linear degree of freedom and soil nail rotation Degree of coordination to solve the problem of connection of degrees of freedom of different units to obtain the internal force distribution of soil nail and the displacement of excavation surface in different positions. Compared with the recognized conclusion of soil nailing, the result is in good agreement.